What is 2K injection molding?

1. The principle of 2K injection molding technology
The principle of 2K injection molding technology is mainly based on traditional injection molding technology, but it has higher requirements in mold design, injection molding process, and material selection. In the 2K injection molding process, the first type of plastic material is first injected into a cavity of the mold through a special set of molds, forming the basic structure or inner layer of the product. Next, one or more gates are opened at specific locations in the mold to inject the second plastic material onto the already cured first material, forming the outer or covering layer of the product. In this process, it is necessary to precisely control the injection time, injection pressure, and injection speed of the two materials to ensure that they can be perfectly combined.
To achieve 2K injection molding, mold design is crucial. The mold needs to have a special parting surface and gate design to ensure that the two materials can be accurately combined during the injection molding process. At the same time, the mold also needs to have high-precision processing and assembly capabilities to ensure the dimensional accuracy and surface quality of the product.
2. The application of 2K injection molding technology
2K injection molding technology has a wide range of application fields, especially in the manufacturing of plastic products that require high quality and high added value, and its advantages are particularly obvious. The following are several typical application areas:
In the field of electronic products: With the continuous development and popularization of electronic products, the requirements for the appearance, feel, and durability of plastic products are becoming increasingly high. 2K injection molding technology can combine soft rubber materials with hard plastic materials to form beautiful and durable electronic product casings, buttons, and other components.
In the field of automotive components: Automotive components need to withstand complex mechanical and chemical environments, and have very high requirements for material performance. 2K injection molding technology can combine plastic materials with different properties to form automotive components with high strength, wear resistance, and corrosion resistance, such as instrument dials, door handles, etc.
Medical device field: Medical devices need to have good biocompatibility and corrosion resistance. 2K injection molding technology can combine metal materials such as stainless steel with plastic materials to form medical devices that meet biocompatibility requirements and have excellent corrosion resistance, such as surgical instruments and artificial joints.